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package org.glassfish.jersey.message.internal;

import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.lang.annotation.Annotation;
import java.lang.reflect.Type;

import javax.ws.rs.Consumes;
import javax.ws.rs.Produces;
import javax.ws.rs.core.MediaType;
import javax.ws.rs.core.MultivaluedMap;

import javax.inject.Singleton;

/**
 * Provider for marshalling/un-marshalling of {@code application/octet-stream}
 * entity type to/from a {@link File} instance.
 *
 * @author Paul Sandoz
 * @author Marek Potociar (marek.potociar at oracle.com)
 */
@Produces({"application/octet-stream", "*/*"})
@Consumes({"application/octet-stream", "*/*"})
@Singleton
public final class FileProvider extends AbstractMessageReaderWriterProvider<File> {

    @Override
    public boolean isReadable(final Class<?> type,
                              final Type genericType,
                              final Annotation[] annotations,
                              final MediaType mediaType) {
        return File.class == type;
    }

    @Override
    public File readFrom(final Class<File> type,
                         final Type genericType,
                         final Annotation[] annotations,
                         final MediaType mediaType,
                         final MultivaluedMap<String, String> httpHeaders,
                         final InputStream entityStream) throws IOException {
        final File file = Utils.createTempFile();
        final OutputStream stream = new BufferedOutputStream(new FileOutputStream(file));

        try {
            writeTo(entityStream, stream);
        } finally {
            stream.close();
        }

        return file;
    }

    @Override
    public boolean isWriteable(final Class<?> type,
                               final Type genericType,
                               final Annotation[] annotations,
                               final MediaType mediaType) {
        return File.class.isAssignableFrom(type);
    }

    @Override
    public void writeTo(final File t,
                        final Class<?> type,
                        final Type genericType,
                        final Annotation[] annotations,
                        final MediaType mediaType,
                        final MultivaluedMap<String, Object> httpHeaders,
                        final OutputStream entityStream) throws IOException {
        final InputStream stream = new BufferedInputStream(new FileInputStream(t), ReaderWriter.BUFFER_SIZE);

        try {
            writeTo(stream, entityStream);
        } finally {
            stream.close();
        }
    }

    @Override
    public long getSize(final File t,
                        final Class<?> type,
                        final Type genericType,
                        final Annotation[] annotations,
                        final MediaType mediaType) {
        return t.length();
    }
}
